Abstract Mesocellular foam (MCF) silica molecular sieve material was successfully synthesized using a hydrothermal method. X-ray diffraction, infrared spectroscopy, low nitrogen adsorption–desorption, scanning electron microscopy, and transmission electron microscopy (TEM) characterization techniques were used to characterize the material. Low temperature nitrogen adsorption–desorption method showed that pore size of the synthesized MCF was 12 nm. TEM study showed that the synthesized MCFs had honeycomb structure pores, which can be good for the absorbance of dye organic macromolecule substances. This work studied the adsorption of crystal violet by MCF and the results showed that when the adsorptive conditions were pH = 9.0, MCF:crystal violet = 150:1, and when the contact time was 10 min at room temperature of 25 ± 1 °C, the adsorption rate reached 99.71% and adsorption capacity was 6.646 mg/g. This study found that the adsorption is a Freundlich type, it is a multimolecular layer adsorption, and it belongs to the pseudo-second-order kinetic model. According to the ΔG0 obtained from adsorption thermodynamics, when the temperature is 25–40 °C, the adsorption enthalpy change ΔH0 = −25.65 kJ/mol, ΔG0 < 0, the adsorption is an exothermic reaction and can spontaneously occur. The adsorption entropy change ΔS0 = 5.54 J/(mol·K) and the entropy of system increased.

中文翻译：

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纳米介孔泡沫二氧化硅从水溶液中吸附结晶紫的研究：过程平衡、动力学、等温线和热力学研究

摘要采用水热法成功合成了介孔泡沫（MCF）二氧化硅分子筛材料。使用X射线衍射、红外光谱、低氮吸附-解吸、扫描电子显微镜和透射电子显微镜（TEM）表征技术来表征材料。低温氮气吸附-脱附法表明合成的MCF孔径为12 nm。TEM研究表明，合成的MCF具有蜂窝状结构孔，有利于染料有机高分子物质的吸光。本工作研究了MCF对结晶紫的吸附作用，结果表明，当吸附条件为pH=9.0、MCF:结晶紫=150:1、室温25±1℃、接触时间为10min时，吸附率达到99.71%，吸附容量为6.646 mg/g。研究发现该吸附为Freundlich型，属于多分子层吸附，属于准二级动力学模型。根据吸附热力学得到的ΔG0，当温度为25～40℃时，吸附焓变ΔH0=-25.65 kJ/mol，ΔG0＜1。0，吸附是放热反应，可以自发发生。吸附熵变ΔS0=5.54 J/(mol·K)，体系熵增加。